The MMA star wore a robe made for him by fashion designer Donatella Versace (Image: Zuffa LLC)

Wearing a robe made for him by fashion designer Donatella Versace, emblazoned with his name and "Notorious" nickname in gold on the back, McGregor said he felt in "pristine condition" as he had his hands wrapped for the workout.

"This is a fight that has been in my crosshairs since Floyd's been opening his mouth, simple as that," McGregor said of his decision to chase a match-up against one of the greatest boxers of all time.

McGregor showed off his skills at the UFC Performance Institute in Vegas (Image: Zuffa LLC)

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Both fighters have said that the contest at the T-Mobile Arena will not go the full 12 rounds.

Mayweather told the media at his workout on Thursday that the fight going the distance would represent a victory for his 29-year-old opponent.

Mayweather claims the fight going the distance would represent a victory for his opponent (Image: Zuffa LLC)

The MMA fighter says his opponent is "scared" (Image: Zuffa LLC)

"You know what I heard him say yesterday? Nothing," McGregor scoffed when asked about the statement.

"I saw a man scared, that's what I saw, I saw a lacklustre workout, I saw a man trying to talk himself out of it. That's what I saw."

McGregor warms up in the ring (Image: REUTERS)

The £500m mega fight is on August 26th (Image: Zuffa LLC)

McGregor warmed up and then pulled on his boxing gloves, working up a sweat on a selection of punch bags for 12 three-minute rounds.

After a flurry of punches on the final bag, McGregor still had one more parting shot for boxing fans who he says are bored with how their sport.

"I just want to say to all of boxing - it's OK to love me as much as I love me. It's OK. Let it go," a beaming McGregor said.